Version 3.3.0.270 issued an Alert for Fragmentation via email but there is no Alert in the UI. This appears to be a two-part bug... 1) No Alert listed and 2) No Indexes actually qualify - see bolded-red below.

This looks like the content of an Alert Ended alert email, which is confirmed by the "Time ended" detail.

If we work to this assumption, then this explains why it contains the entry "Indexes above fragmentation threshold: 0" as this would end the conditions that led to the alert being generated (would lead to the alert being marked as 'ended'). Given that the alert was generated over a month ago, and assuming that the purge settings are still set to default, then once the alert 'ended' then the data would have been purged.

Would you consider:
1. NOT purging "Open" Alerts like this.
2. Including the ORIGINAL Alert reference in the "Ended" email so it can be shown in the UI with one click.
3. Including a BIG BOLD"ALERT SPANS <LONG DURATION>" chunk of verbiage in the email to bring our attention to this kind of thing - I seriously don't have time to read every alert in detail so the more you can highlight "Weird stuff" the more help it is.

<LONG DURATION> should be anything more than the data purge period and optionally, configurable, perhaps, anything over X days. I typically only care about the ORIGINAL Alert email and not the Ended one for 95%+ of reported incidents - I investigate the original, deal with it, clear it, and move on. To be "woken up" so to speak, with really OLD NEWS is noise I don't need so anything you can do to reduce the noise level of Ended emails would be brilliant!

1. From the information available it looks like the alert was purged after it Ended, despite it exceeding the 2 week purge window.
2. The URL would lead to the Alert, if it was still available. Notice in the URL is the unique id of the alert, this does not change and always leads to the same alert details page. There is not a different one for different alert statuses.
3. This could be considered for a future release.

Finally, you can configure the email settings so that it doesn't send out email 'Ended' status emails. This can be configured globally, for groups, individually etc.